Mold for making building-blocks.



N0. 852,892. PATENTED MAY 7, 1907. D. T. MoGALL.

MOLD FOR MAKING BUILDING BLOCKS. v

APPLIGATION FILED MAY 31, 1906.

PATENT QBFIGEQ DONALD T. McCALL, OF JACKSON, MICHIGAN.

MOLD FOR MAKING BUILDING-BLOCKS.

Specification of Letters Patent.

Patented May 7, 1907.

Application filed May 31, 1906. Serial No; 319,424:-

This invention relates to molds for making artificial building blocks; it has for its object an improved mold which can be readily adjusted to produce blocks of different length,-

and which retains the capacity of expanding in order that the mold may be removed from the mass of material, of which the block is made.

The mold in which this invention is embodied comprises end and side pieces with attachments by means of which the mold may be lengthened while still retaining a rigidly rectangular construction andmay be expanded both laterally and longitudinally simultaneously.

This invention also relates to a removable block inclosed with the mold, which is used to produce in the stone a groove to be utilized either for bonding purposes or for the purpose of holding a naihng strip or plug.

In the drawing :Figure 1,isaperspective, showing the mold in closed condition. Fig. 2, is a perspective, showing the mold in expanded condition.

The mold consists of two side ieces A a, and two end pieces B, b. The si e A is adjustably secured to the end B, by means of a band of metal E, which is looped around the side A, and is secured along the upper and lower edges of the end B. The loop E engages closely around the side A, and holds the pieces A and B together in relation at rightangles, and yet allows the piece A to slide longitudinally under the loop, and between the bend of the loop and the end of the piece B; holding screws 3 engage through the loop and against the face of the piece A, the face of the piece A, being preferably covered and protected by a piece of metal 4, which moves with the loop. The side a and end I), are secured together in the same way by a band 6 that is'secured to the end I) and passes around the side a. The end of the side A is held to the end of the end I), by an expansion joint constructed by beveling the meeting ends of A and Z), placing guide pins g in one of the parts, the guidev pins engaging in suitable guide holes in the other part, and the members being then held together by a tie clasp pivotally secured to one of the members, as the end I), and engaging over the corners of both members and against the face of the side A. The corners of the members A and B, are secured by an exactly similar construction.

The tieiclasp f is actuated by a link K, pivoted to tlie upright bar of the tie clasp f and pivoted to the end of a lever M, which is itself pivoted to the side member A.

WVhen the free end of the lever M, is swung, it actuates the link K, and the tie clasp actuated in one direction it locks the corners together, actuated in another direction it loosens the corners, so that they may expand.

In order that the tie clasp itself may act as the expander, a confining finger R is secured to the face of the member A; this is provided with a portion raised from the face A, and the raised portion hangs over a bar of the clasp f, so that as the clasp f swings on its pivot, it engages against the inner face of the overhanging part of the finger R, and serves to throw the finger R and the member A, to which it is secured outward.

In order that both the links may be actuated simultaneously and by moving the lever M, and the lever m, in the same direction, the lever M is made as a lever of the first order, and the lever m is made as a lever of the second order, that is, the fulcrum point 7 of the lever M, is between the free end 8 and the pivoted end 9, while the fulcrum point of the lever m is at the end of the lever and the connection between the lever m, and the link 76 is between the fulcrum point 70 and the free end 80 of the lever.

Wall cores n of any suitable shape or dimensions are removably hung to the inside of the frame by hooks 20, which temporarily hold the cores in place and are utilized as attachments by means of which the cores may be removed while the material is yet green and the cores easily removable; these blocks may be of any suitable shapeor dimensions to produce in the building block a groove suitable for bonding or for the reception of a nailing block; the cores n shown in the drawing are shaped properly to produce a dovetailed groove suitable for the reception of a wed e shaped nailing block.

hat I claim is 1. In a mold for building blocks, in combination with side members and end members assembled in pairs, the members of each pair being in sliding connection, clasps adapted to engage over the meeting corners of two bars to secure the same together and means for locking and for thereafter releasing said clasps from engagement over said corners, substantially as described.

2. In a mold for forming building blocks,in combination, a plurality of side members and end members, each end member being slidably connected at one end with one of the side members, means attached to the end of one of the members of each pair and adapted to engage over the adjacent free end of a member of a similar pair whereby the adj acent members may be locked together and means whereby said locking means may be opened and closed, substantially as described. 1

3. In a mold for building blocks, in combination with a side and an end member held together in relation to form two sides of said mold, a clasp adapted to engage over a corner of said mold and secured to one of said members and adapted to fold across the corner and over the face of another of said pieces and means whereby said clasp may be drawn thereover and locked and may be subsequently opened, substantially as described.

4. In a mold for building blocks, in combination with an end member held together in 'nation,a side member, an end member slidingly attached thereto at one of its ends by an inclosing strap secured to the top and bottom edges of said end member, a complementary pair of members similarly attached the one to the other, clasps adapted to en gage across meeting ends of said pairs, and a locking lever on one of each of said pairs of side and end members whereby each clamp is drawn tightly across the end of that one of the members next adjacent, substantially as described.

6. In a mold for building blocks, in combi nation with side and end members assembled in pairs, each pair having two members slidingly engaged, pins unitin the pairs and passing diagonally across t e meeting cor ners of said pairs, each pin being secured to one member of a pair and engaging slidingly in the adjacent member of another pair, substantially as described.

7. In a mold for building blocks, in combination 'with the members forming the sides and ends thereof, a clasp engaging diagonally across the meeting ends of two members of said mold, the said clasp being pivoted to one member thereof, and engaging between the face of an adjacent member and an overhanging finger, whereby the swinging of the link actuates the members both to contract and expand the mold at the joint, substantially as described.

8. In a mold for building blocks,in .combi nation with'a mold of variable length constructed to separate at two of its four corners, tie clasps passing across each of said corners to lock the same in position with re spect to one another and means whereby said clasps may be actuated for either the closure or opening of the corners, substantially as described. 1

9. In a mold for building blocks, in combination with a mold constructed to separate at a corner, a tie clasp passing diagonally across said corner, and means for actuating said clasp, substantially as described.

10. In a mold for building blocks, in combination with a mold constructed to separate at a corner, a guide pin engaging across said corner between the adjacent members, and a DONALD T. MoCALL.

Witnesses:

MAY E. KOTT, CHARLES F. BURTON. 

